问题描述
我正在使用Youtube数据API构建一个iOS应用，该应用会获取频道的播放列表并在表格视图中显示。但是问题是我最多只能获得50个播放列表结果，但是实际的播放列表数量却超过了100.当我在谷歌上搜索时发现要进行额外的分页。如何在iOS应用中添加分页以在表格视图中显示整个播放列表。如果我想使用下一页令牌提出另一个请求，那么应该怎么做？我做到了，应该修改代码的哪一部分。我使用API密钥而不是OAuth
ViewController代码
import UIKit
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
@IBOutlet weak var coursesTV: UITableView!
var a = [Item]()
override func viewDidLoad() {
super.viewDidLoad()
coursesTV.delegate = self
coursesTV.dataSource = self
Playlist.sharedobj.getPlayList { (i) in
self.a = i
dispatchQueue.main.async {
self.coursesTV.reloadData()
}
}
}
func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
return a.count
}
func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "cell")
{
cell.textLabel?.text = a[indexPath.row].snippet!.title!
return cell
}
return UITableViewCell()
}
}
NetworkService结构
import Foundation
public struct Playlist
{
public static let sharedobj = Playlist()
let playlistuRL = "URL_HERE"
let session = URLSession(configuration: .default)
func getPlayList(onSuccess:@escaping([Item])-> Void)
{
let task = self.session.dataTask(with: URL(string: self.playlistuRL)!) { (data,response,error) in
do
{
let item = try JSONDecoder().decode(RootClass.self,from: data!)
print(item.items!.first!.snippet!.title!)
onSuccess(item.items)
}
catch
{
print(error)
}
}
task.resume()
}
}
import Foundation
public struct RootClass: Codable {
public var etag : String!
public var items : [Item]!
public var kind : String!
public var nextPagetoken : String!
public var pageInfo : PageInfo!
}
public struct Default: Codable {
public var height : Int!
public var url : String!
public var width : Int!
}
public struct High: Codable {
public var height : Int!
public var url : String!
public var width : Int!
}
public struct Item: Codable {
public var etag : String!
public var id : String!
public var kind : String!
public var snippet : Snippet!
}
public struct Localized: Codable {
public var descriptionField : String!
public var title : String!
}
public struct Medium: Codable {
public var height : Int!
public var url : String!
public var width : Int!
}
public struct PageInfo: Codable {
public var resultsPerPage : Int!
public var totalResults : Int!
}
public struct Snippet: Codable {
public var channelId : String!
public var channelTitle : String!
public var descriptionField : String!
public var localized : Localized!
public var publishedAt : String!
public var thumbnails : Thumbnail!
public var title : String!
}
public struct Standard: Codable {
public var height : Int!
public var url : String!
public var width : Int!
}
public struct Thumbnail: Codable {
public var defaultField : Default!
public var high : High!
public var medium : Medium!
public var standard : Standard!
}
解决方法
基本上，您必须为tableview实现更多加载概念。当您到达表格的最后一行时，请发出api请求。 Youtube API提供了NextPageToken和PreviousPageToken作为响应。因此，您可以在到达最后一行时使用NextPageToken进行api请求。
示例代码段：
<command>cd ../</command>